|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Microstructure Evolution and Nanoindentation Measurements after Laser Re-solidification of Hypo-eutectic Al-10 at %Cu
||Mohammed Alamoudi, Vishwanadh Bathula, Jörg Wiezorek
|On-Site Speaker (Planned)
After laser melting rapid solidification microstructures of multicomponent alloys exhibit morphological gradients, scale refinement, non-equilibrium phases and solute trapping, and associated property changes. We combined nano-indentation with microstructural analyses by SEM and TEM to study processing-microstructure-property relationships for laser-surface-melted hypo-eutectic Al-10at%Cu. A microstructure gradient develops as the solidification rate increases from the bottom to top of the melt pool. The central region typically comprised a micron-scale refined cellular structure of α-Al(Cu) and nano-scale intercellular θ-Al2Cu or eutectic. The cellular α-Al(Cu) consistently showed Cu-solute supersaturation and a 36% hardness increase relative to as-cast state. Considering the possible contributions from different strengthening mechanisms the observed hardness increase has been attributed to a combination of solute and grain size hardening. Additional studies are conducted to ascertain the effects of the increased solute content and more refined scales of the microstructure regions formed at the higher solidification rates towards the top of the melt-pool.
||Aluminum, Mechanical Properties, Solidification